High-performance brushless methanol fuel pump

Abstract

The utility model discloses a high-performance brushless methanol fuel pump, which comprises an upper cover, a shell, an end cover plate, an oil inlet interface, an oil outlet interface and a brushless motor, and is characterized in that an inner cover plate is arranged on the inner side of the end cover plate, and an inner gearing cycloid gear structure is arranged between the end cover plate and the inner cover plate; the inner gearing cycloid gear structure comprises an outer gear, an inner gear and an eccentric sleeve, an output shaft of the brushless motor is rotatably and hermetically arranged on the inner cover plate in a penetrating manner, the output shaft is in transmission connection with the inner gear, the outer gear is eccentrically meshed with the inner gear, and the pin shaft penetrates through the eccentric sleeve and the outer gear and is arranged in the eccentric sleeve in a matched manner; an oil outlet hole is formed in the inner cover plate corresponding to the meshing side of the inner gear and the outer gear, the oil outlet hole is communicated with the oil outlet connector, an oil inlet hole is formed in the inner cover plate corresponding to the separation side of the inner gear and the outer gear, and the oil inlet hole is communicated with the oil inlet connector. High-performance flow conveying of methanol fuel is achieved.

Description

Technical Field

[0001] The utility model relates to an improved invention of a fuel pump, in particular to an improved invention of a high-performance brushless methanol fuel pump. Background Art

[0002] High-performance fuel pumps generally use gasoline as the main fuel for corresponding operations. As a non-renewable resource, gasoline is relatively expensive and has a high cost. At the same time, the emissions after gasoline combustion cause relatively large pollution to the environment. Moreover, gasoline has strong volatility and there are certain risks during storage and transportation. Compared with gasoline, methanol fuel has the following advantages: 1. Renewable: Methanol can be produced from renewable resources such as biomass, while gasoline mainly comes from non-renewable petroleum resources; 2. Lower cost: In some cases, the production cost of methanol is relatively lower than that of gasoline, which helps to reduce the fuel cost; 3. Environmental friendliness: The products after methanol combustion are relatively clean, and the harmful substances emitted such as carbon monoxide, hydrocarbons, nitrogen oxides, etc. are usually less than those of gasoline, causing relatively less pollution to the environment; 4. High octane number: Methanol has a high octane number and good anti-knock performance, which can increase the compression ratio of the engine and thus improve the engine efficiency. 5. Safety: Methanol has a higher flash point and has certain safety advantages compared with gasoline during storage and transportation.

[0003] Therefore, in view of the above comparison between the two, using methanol as fuel instead of gasoline has certain advantages in the field of high-performance fuel pumps. For high-performance fuel pumps using methanol as the fuel type, they need to have a head function. At the same time, methanol fuel has certain corrosiveness to some materials under the condition of exceeding 100°C, and some parts of the product need to have methanol resistance. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a high-performance brushless methanol fuel pump.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: the high-performance brushless methanol fuel pump comprises an upper cover, an outer shell, an end cover plate, an oil inlet interface and an oil outlet interface, the outer shell is provided with a brushless motor, the upper cover is encapsulated at one end of the outer shell, and a power input connector is provided on the upper cover, the end cover plate is fixed to the other end of the outer shell by a pin, the oil inlet interface and the oil outlet interface are respectively connected to the outer shell, and the characteristic is that: an inner cover plate is provided on the inner side of the end cover plate, and an inner meshing The cycloid gear structure, the internal meshing cycloid gear structure includes an external gear, an internal gear and an eccentric sleeve. The output shaft of the brushless motor is rotatable and sealed on the inner cover plate, and the output shaft is transmission-connected with the internal gear. The external gear is eccentrically meshed with the internal gear. The pin shaft passes through the eccentric sleeve, and the external gear is matched and placed in the eccentric sleeve. An oil outlet hole is provided on the inner cover plate corresponding to the meshing side of the internal gear and the external gear, and the oil outlet hole is connected to the oil outlet interface. An oil inlet hole is provided on the inner cover plate corresponding to the disengagement side of the internal gear and the external gear, and the oil inlet hole is connected to the oil inlet interface.

[0006] The end cover plate, inner cover plate, inner gear, outer gear, eccentric sleeve and pin shaft are all made of stainless steel.

[0007] The upper cover is made of plastic, and the outer shell is a cast aluminum shell.

[0008] A graphite bearing is arranged between the output shaft of the brushless motor and the inner cover plate, and an oil seal is also provided.

[0009] The oil seal is made of fluororubber, which is supported by stainless steel wires.

[0010] An O-type sealing ring is arranged between the end cover plate and the shell.

[0011] The number of teeth of the internal gear is Z1=8, the root circle diameter of the internal gear is Da1=30.7mm, and the tip circle diameter of the internal gear is Df1=40.7mm; the number of teeth of the external gear is Z2=9, the root circle diameter of the external gear is Da2=46mm, and the tip circle diameter of the external gear is Df2=35.7mm.

[0012] The tooth thickness B of the inner gear and the outer gear is 12 mm, and the eccentricity a of the outer gear is 2.5 mm.

[0013] The beneficial effect of the utility model is an improved high-performance brushless methanol fuel pump, whose structural design is a positive displacement fuel pump with an internal meshing cycloid gear structure. This structure can solve the above problems in the following four aspects: 1. From the perspective of structural complexity, the structure has fewer components and is easiest to implement; 2. From the perspective of machining accuracy requirements, the machining accuracy of the gear pump is easiest to meet; 3. From the perspective of methanol-resistant material selection, the gear pump has a simple structure and can better verify the performance of the part material; 4. Compared with other structures (such as screw pumps, etc.), the cycloid gear pump has a more direct power connection method, with less loss, and achieves higher work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a radial cross-sectional view of the present invention.

[0017] Figure 3 It is a structural stereogram of the utility model. DETAILED DESCRIPTION

[0018] The accompanying drawings show the structure of the utility model, and the following further describes its relevant details in conjunction with the accompanying drawings. Figures 1-3 The high-performance brushless methanol fuel pump includes an upper cover 1, a shell 2, an end cover plate 3, an oil inlet interface 4 and an oil outlet interface 5. The shell 2 is provided with a brushless motor 6. The upper cover 1 is encapsulated at one end of the shell 2, and a power input connector is provided on the upper cover 1, and the power input connector is connected to the brushless motor 6. The end cover plate 3 is fixed to the other end of the shell 2 through a pin shaft 16. The oil inlet interface 4 and the oil outlet interface 5 are respectively connected to the shell 2. An inner cover plate 7 is provided on the inner side of the end cover plate 3, and a step is correspondingly provided in the shell 2, and the inner cover plate 7 is against the step. An internal meshing cycloid gear structure is provided between the end cover plate 3 and the inner cover plate 7, and the internal meshing cycloid gear structure includes an external gear 8 and an internal gear 9 and an eccentric sleeve 10, the output shaft of the brushless motor 6 is rotatable and sealed on the inner cover plate 7, and the output shaft is connected to the internal gear 9 in a transmission manner, the external gear 8 is eccentrically meshed with the internal gear 9, the corresponding external gear 8 is provided with internal teeth, and the internal gear 9 is provided with external teeth, the pin shaft 16 passes through the eccentric sleeve 10, the eccentric sleeve 10 is in sealing contact with the end cover plate 3 and the inner cover plate 7 to form a closed cavity, the external gear 8 is matched and placed in the eccentric sleeve 10, the inner cover plate 7 corresponding to the meshing side of the internal gear 9 and the external gear 8 is provided with an oil outlet hole 11, the oil outlet hole 11 is connected with the oil outlet interface 5, the inner cover plate 7 corresponding to the disengagement side of the internal gear 9 and the external gear 8 is provided with an oil inlet hole 12, the oil inlet hole 12 is connected with the oil inlet interface 4.

[0019] The working principle of the present utility model is as follows: The power is input through the upper cover 1 and transmitted to the brushless motor 6 to make it rotate. Then, the brushless motor 6 drives the internal gear 9 to rotate, and the internal gear 9 drives the external gear 8 to rotate eccentrically. Correspondingly, under the action of the internal gear 9 and the eccentric sleeve 10, the external gear 8 continuously meshes with and separates from the internal gear 9 to work. The volume of the space on the disengaged side of the internal gear 9 and the external gear 8 increases from small to large, forming a vacuum to suck in the liquid. The volume of the space on the meshing side of the internal gear 9 and the external gear 8 decreases from large to small, and the liquid is extruded, realizing that the methanol fuel enters from the fuel inlet interface 4 and is supplied from the fuel outlet interface 5 with a high-performance flow rate.

[0020] As a further improved specific implementation manner, the end cover plate 3, the inner cover plate 7, the internal gear 9, the external gear 8, the eccentric sleeve 10, and the pin shaft 16 are all made of stainless steel, having the characteristic of being resistant to methanol corrosion.

[0021] As a further improved specific implementation manner, the upper cover 1 is made of plastic, playing an insulating role and facilitating the access of the power supply. The housing 2 is a cast aluminum housing 2.

[0022] As a further improved specific implementation manner, a graphite bearing 13 is provided between the output shaft of the brushless motor 6 and the inner cover plate 7, which is used to support the brushless motor 6 and can prevent methanol corrosion. And an oil seal 14 is provided. Preferably, the oil seal 14 is a fluororubber, and the fluororubber is internally provided with a stainless steel wire support. The oil seal is pressed against the outer end of the bearing to perform a sealing function.

[0023] As a further improved specific implementation manner, an O-ring 15 is provided between the end cover plate 3 and the housing 2 to play a sealing role.

[0024] As a further improved specific implementation manner, the number of teeth of the internal gear 9 is Z1 = 8, the root circle diameter of the internal gear 9 is Da1 = 30.7 mm, and the tip circle diameter of the internal gear 9 is Df1 = 40.7 mm; the number of teeth of the external gear 8 is Z2 = 9, the root circle diameter of the external gear 8 is Da2 = 46 mm, and the tip circle diameter of the external gear 8 is Df2 = 35.7 mm. Preferably, the tooth thickness B of the internal gear 9 and the external gear 8 is 12 mm, and the eccentricity a of the external gear 8 is 2.5 mm. The generation coefficient k = 1.1220 and the arc diameter coefficient h = 0.2256; the volumetric efficiency coefficient of the gear pump is taken as 0.8 and the pressure coefficient is taken as 0.38; the theoretical calculated flow rate V of the gear pump is approximately 0.1216 * n (L / h); (where n is the rotational speed of the brushless motor); according to the theoretical calculated flow rate, the rated current is confirmed. The device of the present utility model can have a working pressure of 4.5 bar under a rated voltage of 24V, the motor torque T = 0.414 N.mm, the rotational speed of the brushless motor is approximately 13500 r / min, meeting the high-performance flow rate of 800 L / h. Then, through the formula P = T * n / 9550, the calculated rated current is approximately 18 A.

[0025] In summary, the above is only the preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-performance brushless methanol fuel pump, comprising an upper cover, a shell, an end cover plate, an oil inlet interface and an oil outlet interface, wherein a brushless motor is arranged in the shell, the upper cover is encapsulated at one end of the shell, and a power input connector is arranged on the upper cover, the end cover plate is fixed to the other end of the shell by a pin, and the oil inlet interface and the oil outlet interface are respectively connected to the shell, characterized in that: An inner cover plate is provided on the inner side of the end cover plate, and an internal meshing cycloid gear structure is provided between the end cover plate and the inner cover plate, and the internal meshing cycloid gear structure includes an outer gear, an inner gear and an eccentric sleeve. The output shaft of the brushless motor is rotatable and sealed and penetrates through the inner cover plate, and the output shaft is transmission-connected with the inner gear, the outer gear is eccentrically meshed with the inner gear, the pin shaft passes through the eccentric sleeve, and the outer gear is matched and placed in the eccentric sleeve. An oil outlet hole is provided on the inner cover plate corresponding to the meshing side of the inner gear and the outer gear, and the oil outlet hole is connected to the oil outlet interface, and an oil inlet hole is provided on the inner cover plate corresponding to the disengagement side of the inner gear and the outer gear, and the oil inlet hole is connected to the oil inlet interface.

2. The high performance brushless methanol fuel pump according to claim 1, characterized in that: The end cover plate, inner cover plate, inner gear, outer gear, eccentric sleeve and pin shaft are all made of stainless steel.

3. The high performance brushless methanol fuel pump according to claim 1, characterized in that: The upper cover is made of plastic, and the outer shell is a cast aluminum shell.

4. The high performance brushless methanol fuel pump according to claim 1, characterized in that: A graphite bearing is arranged between the output shaft of the brushless motor and the inner cover plate, and an oil seal is also provided.

5. The high performance brushless methanol fuel pump according to claim 4, characterized in that: The oil seal is made of fluororubber, which is supported by stainless steel wires.

6. The high performance brushless methanol fuel pump according to claim 1, characterized in that: An O-type sealing ring is arranged between the end cover plate and the shell.

7. The high performance brushless methanol fuel pump according to claim 1, characterized in that: The number of teeth of the internal gear is Z1=8, the root circle diameter of the internal gear is Da1=30.7mm, and the tip circle diameter of the internal gear is Df1=40.7mm; the number of teeth of the external gear is Z2=9, the root circle diameter of the external gear is Da2=46mm, and the tip circle diameter of the external gear is Df2=35.7mm.

8. The high performance brushless methanol fuel pump according to claim 1, characterized in that: The tooth thickness B of the inner gear and the outer gear is 12 mm, and the eccentricity a of the outer gear is 2.5 mm.

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